English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The papovavirus JC virus (JCV) is highly oncogenic in experimental animals but, unlike simian virus 40 (SV40), is severely restricted in its ability to transform cells in culture. We exploited the close genetic relatedness of these two viruses to delimit region(s) of the T protein which can restrict transforming activity. Novel chimeric genomes were produced by exchanging various segments of the JCV and SV40 T-protein-coding regions. These DNA constructs specified early proteins with in-frame substitutions of analogous amino acid sequences. A second set of genomes was prepared which, in addition to chimeric early proteins, contained substituted regulatory regions. The transformation efficiencies of these chimeric genomes were intermediate between those of SV40 and JCV, with the source of T protein exerting a greater effect than that of the regulatory region. The ability of certain constructs to induce efficient transformation required the presence of an SV40 regulatory region or specific sequences within the SV40 early coding region. Cloned cell lines prepared from representative transformants were characterized; the ability to form colonies in soft agarose was investigated, and the presence of viral T and cellular p53 proteins was determined. The various T proteins differed in amount, stability, and the ability to form stable complexes with p53.

journal of virology

JC virus-simian virus 40 genomes containing heterologous regulatory signals and chimeric early regions: identification of regions restricting transformation by JC virus